I'm almost certain it is. Two of my channels when they were ranked just outside the top 100k were B- and when they were ranked just inside 100k they were B. I've checked this breakdown with several other channels too.[DOUBLEPOST=1535100773,1535100705][/DOUBLEPOST]No I really don’t think it’s based on that.
From what I recall, you’re actually missing a whole letter grade. Social blade goes into C-, D+, D, and D-